temp sensor readings

90

Asked by Topdog351 Oct 14, 2020 at 10:27 PM about the 2007 Ford F-150 FX4 SuperCab

Question type: Maintenance & Repair

) I haven't been on here in a while. Sorry bout that, but I have a problem with a 07 f150 5.4 3v. it is running rich and flooding. I show 3 temp sensors in the pcm data stream. coolant, iat and out temp. what is the out temp? what ever and where ever it is it reads bad at times.

1 Answer

90

Ok - Topdog here: I have a solution for my own problem and it may help others. I had a problem with too much fuel pressure. I put a manual gauge on it and found the pressure going up to 80 lbs. I spent time checking the wiring diagrams and running test. I finally found a voltage problem at the fuel pressure sensor. I the reference wire shorted to the signal voltage. This was caused by a shorted power steering switch. ( A shorted power steering switch caused the fuel pressure sensor to to run the fuel pressure too high.) If you are having a problem with fuel pressure unplug the power steering switch and see what happens! My Idea, Hope it helps..

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